Revert 170641 because it broke mac-debug build.

ui/base/events/event_dispatcher.cc

Index: ui/base/events/event_dispatcher.cc
===================================================================
--- ui/base/events/event_dispatcher.cc	(revision 170644)
+++ ui/base/events/event_dispatcher.cc	(working copy)
@@ -24,6 +24,31 @@
   return handler->OnEvent(event);
 }
 
+EventResult EventDispatcher::DispatchEventToSingleHandler(EventHandler* handler,
+                                                          KeyEvent* event) {
+  return handler->OnKeyEvent(event);
+}
+
+EventResult EventDispatcher::DispatchEventToSingleHandler(EventHandler* handler,
+                                                          MouseEvent* event) {
+  return handler->OnMouseEvent(event);
+}
+
+EventResult EventDispatcher::DispatchEventToSingleHandler(EventHandler* handler,
+                                                          ScrollEvent* event) {
+  return handler->OnScrollEvent(event);
+}
+
+EventResult EventDispatcher::DispatchEventToSingleHandler(EventHandler* handler,
+                                                          TouchEvent* event) {
+  return handler->OnTouchEvent(event);
+}
+
+EventResult EventDispatcher::DispatchEventToSingleHandler(EventHandler* handler,
+                                                          GestureEvent* event) {
+  return handler->OnGestureEvent(event);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // EventDispatcher::ScopedDispatchHelper